package com.zzl.ssm.controller;

import com.zzl.ssm.domain.SysLog;
import com.zzl.ssm.service.ISysLogService;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.annotation.After;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.stereotype.Component;
import org.springframework.web.bind.annotation.RequestMapping;

import javax.servlet.http.HttpServletRequest;
import java.lang.reflect.Method;
import java.util.Date;

@Component
@Aspect
public class LogAop {

    @Autowired
    private HttpServletRequest request;

    @Autowired
    private ISysLogService sysLogService;

    private Date visitTime;//开始时间
    private Class clazz;//访问的类
    private Method method;//访问的方法

    //前置通知  主要是获取开始时间，执行的类是哪一个，执行哪一个方法
    @Before("execution(* com.zzl.ssm.controller.*.*(..))")
    public void doBefore(JoinPoint jp) throws NoSuchMethodException {
        visitTime = new Date();//当前时间就是开始访问时间
        clazz = jp.getTarget().getClass();//具体要访问的类
        String methodName = jp.getSignature().getName();//获取访问的方法的名称
        Object[] args = jp.getArgs();//获取访问的方法参数

        if (args == null || args.length == 0) {
            method = clazz.getMethod(methodName);
        } else {
            Class[] classesArgs = new Class[args.length];
            for (int i = 0; i < args.length; i++) {
                classesArgs[i] = args[i].getClass();
            }
            clazz.getMethod(methodName, classesArgs);
        }
    }

    //后置通知
    @After("execution(* com.zzl.ssm.controller.*.*(..))")
    public void doAfter(JoinPoint jp) throws Exception {
        long time = new Date().getTime() - visitTime.getTime();//获取访问的时长

        String url = "";

        //获取URL
        if (clazz != null && method != null && clazz != LogAop.class&&clazz != SySLogController.class) {
            //1.获取类上的@RequestMapping("")
            RequestMapping classAnnotation = (RequestMapping) clazz.getAnnotation(RequestMapping.class);
            if (classAnnotation != null) {
                String[] classValues = classAnnotation.value();

                //2.获取方法上的@RequestMapping
                RequestMapping methodAnnotation = method.getAnnotation(RequestMapping.class);
                if (methodAnnotation != null) {
                    String[] methodValue = methodAnnotation.value();
                    url = classValues[0] + methodValue[0];
                }
            }
            //获取访问的ip
            String ip = request.getRemoteAddr();

            //获取当前操作用户
            SecurityContext context = SecurityContextHolder.getContext();//从上下文获得当前的登陆用户
            User user = (User) context.getAuthentication().getPrincipal();
            String username = user.getUsername();

            //将日志相关信息封装到sysLog对象
            SysLog sysLog = new SysLog();
            sysLog.setExecutionTime(time);
            sysLog.setIp(ip);
            sysLog.setMethod("[类名]"+clazz.getName()+"方法名"+method.getName());
            sysLog.setUrl(url);
            sysLog.setUsername(username);
            sysLog.setVisitTime(visitTime);

            //调用service完成
            sysLogService.save(sysLog);
        }

    }

}
